<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="jq/jquery-1.7.1.js" type="text/javascript" charset="utf-8"></script>
	</head>
	<style type="text/css">
		.parentWrap {
			width: 200px;
			text-align: center;
			margin: 100px auto;
		}
		
		li {
			list-style: none;
		}
		
		.groupTitle {
			display: block;
			height: 20px;
			line-height: 20px;
			font-size: 16px;
			border-bottom: 1px solid #ccc;
			cursor: pointer;
		}
		
		.menuGroup {
			border: 1px solid #999;
			background-color: #e0ecff;
		}
		
		.menuGroup> div {
			height: 200px;
			background-color: #fff;
			display: none;
		}
	</style>
	<script>
	$(function(){
		$(".menuGroup").mouseover(function(){
			$(this).children("div").show();
			$(this).siblings().children("div").hide();
		})
		$(".menuGroup").mouseout(function(){
			$(".parentWrap div").hide();
		})
	});
	</script>

	<body>
		<ul class="parentWrap">
			<li class="menuGroup">
				<span class="groupTitle">标题1</span>
				<div>我是弹出来的div1</div>
			</li>
			<li class="menuGroup">
				<span class="groupTitle">标题2</span>
				<div>我是弹出来的div2</div>
			</li>
			<li class="menuGroup">
				<span class="groupTitle">标题3</span>
				<div>我是弹出来的div3</div>
			</li>
			<li class="menuGroup">
				<span class="groupTitle">标题4</span>
				<div>我是弹出来的div4</div>
			</li>
		</ul>
	</body>

</html>